6cells 18650 and 2cells 21700 and with the way i vape i always charge them all for sure once per week and maybe 2 times cause i never let any battery run until empty in the mod..
All i make sure is i rotate using the cells so there is no way a cell or couple of cells for double bat mod be used twice…
And also when i put them into charger or mod i always make sure the logo of the wraps or the manufacturer codes on the wrap are centered.
